I've been on 10mg of isradipine for 2 years. As Tupelo3 points out, this is not a new finding. You can find several PD blogs with personal experiences using isradipine.... not many report a noticeable change in progression.

I think you will find that 10mg is a small dose.

Up until 2012, isradipine was available in continuous release form (DynaCirc CR) and, in my opinion, was more effective in PD.

I do think stadard isradipine has a very mild positive effect in PD. And, no, I have no proof.

I do have slightly high blood pressure, which isradipine fixes... if it slows my PD, that's a bonus.